Pixel clock generator

Details Pixel clock generator Pixel clock generator

1995-04-05

1997-09-23

Vu, Kim

Facsimile and static presentation processing

Facsimile

Picture signal generator

358471, 358410, 358494, 358409, 358412, H04N 140, H04N 136, H04N 104

Patent

active

056710690

ABSTRACT:
A pixel clock generator in which the frequency of a pixel clock signal is changed over for every scanning face prior to start of image record scanning, comprises a first scanning time detection circuit for detecting scanning period of time from the start of image scanning to the end of the image scanning; a reference clock signal generation circuit for generating a reference clock signal to make the frequency of the reference clock signal variable; a number-of-pixel-clocks setting circuit for setting the number of pixel clocks corresponding to forecast scanning time; a second scanning time detection circuit for counting the pixel clocks generated based the reference clock signal by the number set by the number-of-pixel-clocks setting circuit to detect the scanning time corresponding to the forecast scanning time; a comparison circuit for comparing the time detected by the first scanning time detection circuit with the time detected by the second scanning time detection circuit to obtain a comparison result; a correction data storage circuit for storing data for correcting the second scanning time for every scanning face; a renewal circuit for renewing the correction data of the correction data storage circuit according to the result of the comparison result; and a correction circuit to perform variable control by correcting the frequency of the reference clock signal outputted from the reference clock signal generator according to the data renewed by the renewal circuit.

REFERENCES:
patent: 4204233 (1980-05-01), Swager
Douglas N. Curry, "Polygon Laser Scanner Fast Scan Spatial Linearity Correction," The Sixth International Congress on Advances in Non-Impact Printing Technologies, Oct. 21-26, 1990, pp. 980-985.
"Scan Correction for High-Speed Laser Printers," IBM Technical Disclosure Bulletin, vol. 32, No. 9A, Feb. 28, 1990, pp. 343-344.

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